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The eye that was not seeing well,getting a full vision immediately after surgery,the eye is not used to so much of brightness.It usually takes 4-6 weeks before the problem is under control.Again the problem is very subjective.Motion sickness can be due to some underlying problem ,like cervical spondylitis aggravated after the surgery

Although in most cases cataract surgery leads to excellent vision with minimal side effects, some minor side effects do occur in a minority of patients. Light sensitivity can be there in cases where the cataract had been there for a long period of time and then operated. Also in the initial days after cataract surgery the pupil is sometimes kept dilated with the help of eye drops, this also results in light sensitivity. Both of these disappear after sometime. But one has to rule out decentration of the implanted Intra ocular lens if the dizziness and light sensitivity persists. It would be more helpful if you could provide details about what surgery was done ( phaco/ ecce), and what medications the patient is currently on.